Income Taxes (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Deferred:
Income tax benefit (provision) from continuing operations	$ (27,606)	$ (3,233)	$ (61,947)	$ 13,137
Income Taxes (Textual) [Abstract]
Income tax benefit (Provision)	(27,606)	(3,233)	(61,947)	13,137
United States - Alternative Minimum tax [Member]
Current:
Federal tax expense (benefit)	93	(3)	2,031	(3)
United States - Foreign Withholding [Member]
Current:
Federal tax expense (benefit)	(157)	(490)	(648)	(1,605)
UNITED STATES
Deferred:
Federal tax expense (benefit)	1,364	1,918	(1,041)	16,404
ARGENTINA
Current:
Foreign tax expense (benefit)	(23)	(3,505)	60	(5,646)
AUSTRALIA
Current:
Foreign tax expense (benefit)	(1,164)	(82)	(1,823)	(139)
Deferred:
Foreign tax expense (benefit)	306	228	(153)	(354)
MEXICO
Current:
Foreign tax expense (benefit)	(504)	(40)	(644)	(123)
Deferred:
Foreign tax expense (benefit)	(2,459)	5,201	(12,521)	15,564
Income Taxes (Textual) [Abstract]
Net operating loss carryforward period			10 years
BOLIVIA
Current:
Foreign tax expense (benefit)	(22,741)	(6,973)	(47,746)	(9,863)
Deferred:
Foreign tax expense (benefit)	$ (2,321)	$ 513	$ 538	$ (1,098)